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This balanced text offers a concise and readable introduction to world population growth and its implications for the future. With a population currently exceeding six billion and expected to reach ten billion by mid-century, the globe faces a demographic situation that is now more critical than ever before. While the developed world grapples with the problems of an aging and declining population, the developing world will contend with the opposite dilemma of explosive growth. And so the strongest factors shaping the global environment in the decades to come will include population fertility,